Feature films are works of art, and so, those who make them would argue, are film trailers. Some famously effective ones, like an early teaser for the classic Jurassic Park, are entirely separate mini-movies containing no actual footage from the film. Yet it is a general norm that a movie trailer consists of artfully edited scenes from a movie to give you a hint of what that movie has to deliver to its eventual consumer.
Two ridiculous fans of actress Ana de Armas think violating that norm means someone owes a ton of cash. Peter Michael Rosza and Conor Woulfe got so excited by the sight of that actress (having the protagonist sing "Something" to her on a TV talk show) in a trailer for the 2019 film Yesterday (about a singer/songwriter in a world where the Beatles never existed) that her being edited out of the final film as released was a huge blow to them.
